Square D LJL36400U31X - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState

Introducing the Square D LJL36400U31X, a 400 A, 600 V, 3-pole molded case circuit breaker built to safeguard your panelboards and load centers. Designed for dependable branch circuit overcurrent and short-circuit protection, this unit delivers reliable performance when it matters most.

• Space-conscious design: The compact molded case profile maximizes panel space, making it easier to fit into tight electrical enclosures without compromising protection.
• Thermal-magnetic protection: A thoughtfully engineered trip unit provides stable, repeatable protection performance across varying conditions, helping prevent nuisance trips while ensuring safety.
• OEM-compatible: Specifically engineered to be compatible with matching OEM load centers and panelboards, simplifying installation and ensuring dependable operation within your existing system.
• Versatile applications: Suitable for residential, commercial, and light industrial environments where robust 3-pole protection at 600 V is required.

Technical specifications at a glance

• Manufacturer: Square D
• Part Number: LJL36400U31X
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 400 A
• Voltage Rating: 600 V
• Number of Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Practical usage scenarios include upgrading panel protection for high-demand feeders, integrating into commercial electrical rooms where 3-pole coordination is essential, and enabling safer, more reliable three-phase distribution in light industrial settings. By pairing this breaker with compatible OEM panelboards, you gain a cohesive protection solution that reduces troubleshooting time and supports long-term electrical system reliability.